2results about How to "Reduce brazing temperature" patented technology

This invention proposes a brazing method for aluminum alloys based on surface activation and a pre-placed Ni layer. The method includes: Step 1, pre-treating the aluminum alloy surface to be brazed to ensure it is dust-free and oil-free; Step 2, subjecting the aluminum alloy surface to ion bombardment to remove the oxide film and activate the surface; Step 3, depositing a Ni thin film on the aluminum alloy surface to form a pre-placed Ni layer; Step 4, assembling the aluminum alloys to be brazed and placing them in a vacuum brazing furnace, with the Ni layers of the two aluminum alloys in contact. Pressure is applied to ensure the upper and lower aluminum alloys are tightly bonded and to prevent relative sliding. The furnace is then vacuum-heated to 540℃~585℃ and held for a preset time before cooling to room temperature to obtain an aluminum alloy / Ni / aluminum alloy brazed joint. The joint obtained by this surface-activated, pre-placed Ni layer-based aluminum alloy brazing method has the characteristics of no oxide film at the interface, high tensile strength, and low deformation rate.

This application discloses a method for preparing a powder-rolled brazing plate for low-temperature brazing, comprising: preparing alloy powder; preparing an aluminum alloy shell, and loading the alloy powder into the aluminum alloy shell; performing hot isostatic pressing and hot rolling to obtain the brazing plate; wherein the mass percentage of the alloy powder is: Si 6-12.5%, Cu 1.8-10%, Zn 3.8-20%, Fe 0.1-1.1%, with the balance being aluminum; the thickness of the aluminum alloy shell is 10-20 mm. This method can reduce the brazing temperature of the product, achieving brazing at 530-550℃ with excellent brazing results.